【Objective】To evaluate the repair of bony erosion of the skull base following radiotherapy in nasopharyngeal carcinoma(NPC) and investigate the effect of bony repair on overall survival rate and its related factors.【Method】Between July 2003 to June 2005, 201 NPC patients confirmed by pathology and MRI skull base erosion were retrospectively reviewed. These patients had completed treatment and received regular MRI follow-up. The appearance of bony repair in the previous destructive part of the skull base was...